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Now showing items 21-40 of 48

  • Glueball spectrum and matrix elements on anisotropic lattices 

    PEARDON, MICHAEL JAMES (American Physical Society, 2006)
    The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing ranging from ...
  • Glueball spectrum from an anisotropic lattice study 

    PEARDON, MICHAEL JAMES (American Physical Society, 1999)
    The spectrum of glueballs below 4 GeV in the SU~3! pure-gauge theory is investigated using Monte Carlo simulations of gluons on several anisotropic lattices with spatial grid separations ranging from 0.1 to 0.4 fm. Systematic ...
  • The glueball spectrum from novel improved actions 

    PEARDON, MICHAEL JAMES (Elsevier, 2000)
    Results for the inter-quark potential and low-lying SU(3) glueball spectrum from simulations using a new improved action are presented. The action, suitable for highly anisotropic lattices, contains a two-plaquette ...
  • Heavy hadrons on an anisotropic lattice 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)
    Results from simulations of quarkonia and heavy-light mesons on an anisotropic lattice are presented. The improved quark action and action-parameter tuning used in this study are discussed.
  • High performance scientific computing using FPGAS with IEEE floating point and logarithmic arithmetic for lattice QCD 

    PEARDON, MICHAEL JAMES (IEEE, 2006)
    The recent development of large FPGAs along with the availability of a variety of floating point cores have made it possible to implement high-performance matrix and vector kernel operations on FPGAs. In this paper we seek ...
  • Improved stochastic estimation of quark propagation with Laplacian Heaviside smearing in lattice QCD 

    PEARDON, MICHAEL JAMES (2011)
    A new method of stochastically estimating the low-lying effects of quark propagation is proposed which allows accurate determinations of temporal correlations of single-hadron and multihadron operators in lattice QCD. The ...
  • Improving Algorithms to Compute All Elements of the Lattice Quark Propagator 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)
    We present a new exact algorithm for estimating all elements of the quark propagator. The advantage of the method is that the exact all-to-all propagator is reproduced in a large but finite number of inversions. The ...
  • In search of a scaling scalar glueball 

    PEARDON, MICHAEL JAMES (Elsevier, 1999)
    Anisotropic lattices are an efficient means of studying the glueballs of QCD, however problems arise with simulations of the lightest, scalar state. The mass is strongly dependent on the lattice spacing, even when ...
  • Isoscalar meson spectroscopy from lattice QCD 

    THOMAS, CHRISTOPHER; PEARDON, MICHAEL JAMES (2011)
    We extract to high statistical precision an excited spectrum of single-particle isoscalar mesons using lattice QCD, including states of high spin and, for the first time, light exotic J(PC) isoscalars. The use of a novel ...
  • Matrix models, quantum gravity and the spectral dimension 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Proceedings of Science, 2005)
    Monte Carlo studies on non-perturbative 2D Euclidean Quantum Gravity can be done with the use of the Dynamical Triangulations method. The Monte Carlo moves defined within the dynamical triangulation method can be encompassed ...
  • Measuring the aspect ratio renormalization of anisotropic-lattice gluons 

    PEARDON, MICHAEL JAMES (American Physical Society, 2001)
    Using tadpole-improved actions we investigate the consistency between different methods of measuring the aspect ratio renormalization of anisotropic-lattice gluons for bare aspect ratios x054,6,10 and inverse lattice spacing ...
  • Mesons at high temperature in Nf=2 QCD 

    PEARDON, MICHAEL JAMES; SKULLERUD, JONIVAR (American Physical Society, 2006)
    We report first results for spectral functions of charmonium in 2-flavour QCD. The spectral functions are determined from vector and pseudoscalar correlators on a dynamical, anisotropic lattice. J/ and c are found ...
  • Multi-hadron operators with all-to-all quark propagators 

    PEARDON, MICHAEL JAMES (2008)
    Hadron spectroscopy on dynamical configurations are faced with the difficulties of dealing with the mixing of single particle states and multi-hadron states (for large spatial volumes and light dynamical quarksmasses). ...
  • Multiple molecular dynamics time-scales in Hybrid Monte Carlo fermion simulations 

    PEARDON, MICHAEL JAMES; SEXTON, JAMES CHRISTOPHER (Elsevier, 2003)
    A scheme for separating the high- and low-frequency molecular dynamics modes in Hybrid Monte Carlo (HMC) simulations of gauge theories with dynamical fermions is presented. The algorithm is tested in the Schwinger model ...
  • Non-perturbative study of QCD on a 2 + 2 anisotropic lattice 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)
    We present preliminary results for the non-perturbative determination of the parameters in a 2+2 anisotropic action. The parameters are required to restore Lorentz invariance in long-distance correlators, using the ...
  • Nonperturbative study of the action parameters for anisotropic-lattice quarks 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2006)
    A quark action designed for highly anisotropic-lattice simulations is discussed. The mass-dependence of the parameters in the action is studied and the results are presented. Applications of this action in studies of ...
  • A perturbative determination of the parameters of an anisotropic quark action 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2005)
    The parameters of a 3+1 anisotropic quark action with Symanzik-improved glue are determined at 1-loop in perturbation theory.
  • Phase shift of isospin-2 pi pi scattering from lattice QCD 

    THOMAS, CHRISTOPHER; PEARDON, MICHAEL JAMES (2011)
    Finite-volume lattice QCD calculations offer the possibility of extracting resonance parameters from the energy-dependent elastic phase-shift computed using the Luscher technique. In this letter, as a trial of the method, ...
  • Practical all-to-all propagators for lattice QCD 

    PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)
    A new method for computing all elements of the lattice quark propagator is proposed. The method combines the spectral decomposition of the propagator, computing the lowest eigenmodes exactly, with noisy estimators which ...
  • Progress in lattice algorithms 

    PEARDON, MICHAEL JAMES (Elsevier, 2002)
    The development of Monte Carlo algorithms for generating gauge field configurations with dynamical fermions and methods for extracting the most information from ensembles are summarised.